TR2/3/3A Mounting Slave Cylinder

[TR3driver]

There are three of us in this discussion that are having the same problem and one other that I have spoken to. If there is a mechanical problem that keeps the slave from being adjusted what could it be? Clutch, pressure plate, throw out bearing? Would you venture an opinion?

Two most common in my experience are broken taper pin, and clutch slave assembled incorrectly. The workshop manual only shows the earlier Lockheed slave arrangement; while the vast majority of TR3s on the road have the later Girling slave (and front disc brakes).
Defective new slave cylinders are certainly a possibility, but I've not heard any confirmed reports of that. It's pretty dang simple, not much to go wrong unless it leaks. Wrong parts could be a possibility too, especially if you're working on a car that originally had front drum brakes. I think the Lockheed pushrod is shorter than the Girling pushrod.

This is the Lockheed arrangement

This is the Girling arrangement

FWIW, I believe the Girling clutch slaves were all 1" bore for TR3 through TR4A. Lockheed, IIRC, was even larger, maybe 1.25"

 

[frankfast]

The Lockheed pushrod being shorter than the Girling pushrod could be the source of the problem if they were somehow mixed up in the cars. One thing I do notice in the illustrations that you've provided is that the spring for the Girling system has a lot less tension than the one I have provided by Moss. \

If I can't adjust this slave because the push rod is too short then I have to conclude that that is the source of the problem. A longer pushrod, properly adjusted, should eliminate the need to double clutch in order to disengage.